Consolidated Statements of Operations - USD ($) shares in Thousands, $ in Thousands	12 Months Ended
Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Income Statement [Abstract]
Net sales	$ 1,136,539	$ 1,078,809	$ 977,025
Cost of sales	644,409	598,522	533,644
Gross profit	492,130	480,287	443,381
Operating expenses:
Research and development and other engineering	47,058	43,056	47,616
Selling	112,568	109,931	114,903
General and administrative	157,274	158,568	142,749
Total operating expenses	316,900	311,555	305,268
Net gain on disposal of assets	(6,024)	(10,579)	(160)
Impairment of goodwill	0	6,686	0
Income from operations	181,254	172,625	138,273
Other Nonoperating Income (Expense)	(1,737)	(634)	(874)
Foreign exchange gain (loss), net	(1,160)	137	894
Gain on bargain purchase of a business	0	0	(6,336)
Loss on disposal of a business	0	0	(211)
Income before taxes	178,357	172,128	144,418
Provision for income taxes	44,375	45,495	51,801
Net income	133,982	126,633	92,617
Translation adjustment, net of tax	885	(12,911)	21,418
Other Comprehensive (Income) Loss, Defined Benefit Plan, after Tax and Reclassification Adjustment, Attributable to Parent	1,064	(376)	944
Comprehensive income	$ 133,803	$ 114,098	$ 113,091
Earnings per share of common stock:
Basic	$ 3.00	$ 2.74	$ 1.95
Diluted	$ 2.98	$ 2.72	$ 1.94
Weighted average number of shares of common stock outstanding
Basic (in shares)	44,735	46,213	47,486
Diluted (in shares)	44,921	46,540	47,774

The aggregate costs incurred (1) in a planned search or critical investigation aimed at discovery of new knowledge with the hope that such knowledge will be useful in developing a new product or service, a new process or technique, or in bringing about a significant improvement to an existing product or process; (2) to translate research findings or other knowledge into a plan or design for a new product or process or for a significant improvement to an existing product or process whether intended for sale or the entity's use, during the reporting period charged to research and development projects, including the costs of developing computer software up to the point in time of achieving technological feasibility, and costs allocated in accounting for a business combination to in-process projects deemed to have no alternative future use; (3) to conduct internal product testing; (4) or to provide engineering support to customers in the form of testing services or product uses, specifications or requirements.

No definition available.